The flange pneumatic ball valve is a kind of valve that can be closed tightly with only 90 degrees of rotation and a small rotating torque. The completely straight valve body cavity provides a straight flow path with little resistance for the medium. It is generally believed that the flange pneumatic ball valve is most suitable for direct opening and closing, but recent development has designed the flange pneumatic ball valve to be used for throttling and flow control. The main characteristics of the flanged pneumatic ball valve are its compact structure, easy operation and maintenance, and suitable for general working media such as water, solvent, acid and natural gas, and also suitable for media with poor working conditions, such as oxygen, hydrogen peroxide, methane and ethylene. The flange pneumatic ball valve body can be integral or combined. Development and working principle of flange pneumatic ball valve flange pneumatic ball valve is evolved from plug valve. It has the same 90 degree rotation lifting action, but the difference is that the cock body is a sphere with a circular through hole or channel passing through its axis. The proportion of the sphere and the passage opening should be such that when the sphere rotates 90 degrees, the inlet and outlet should be all spherical, so as to cut off the flow.

Fault: the sealing surface leaks. 1. The butterfly plate and sealing ring of the butterfly valve contain sundries. 2. The butterfly plate and seal closing position of the butterfly valve do not match correctly. 3. The outlet is equipped with flange bolts that are not pressed or stressed. 4. The pressure test direction is not as required.
Elimination method: 1. Eliminate impurities and clean the valve cavity. 2. Adjust the limit screw of the worm gear or pneumatic actuator to ensure the correct closing position of the valve. 3. Check the flange plane and bolt compression force, which should be evenly compressed. 4. Spin in the direction of the arrow.